package com.google.android.c2dm;

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;

public class C2DMessaging {

	public static final String EXTRA_SENDER = "sender";
	public static final String EXTRA_APPLICATION_PENDING_INTENT = "app";
	public static final String REQUEST_UNREGISTRATION_INTENT = "com.google.android.c2dm.intent.UNREGISTER";
	public static final String REQUEST_REGISTRATION_INTENT = "com.google.android.c2dm.intent.REGISTER";
	public static final String LAST_REGISTRATION_CHANGE = "last_registration_change";
	public static final String BACKOFF = "backoff";
	public static final String GSF_PACKAGE = "com.google.android.gsf";

	// package
	static final String PREFERENCE = "com.google.android.c2dm";

	private static final long DEFAULT_BACKOFF = 30000;

	/**
	 * Initiate c2d messaging registration for the current application
	 */
	public static void register(Context context,
			String senderId) {
		Intent registrationIntent = new Intent(REQUEST_REGISTRATION_INTENT);
		registrationIntent.setPackage(GSF_PACKAGE);
		registrationIntent.putExtra(EXTRA_APPLICATION_PENDING_INTENT,
				PendingIntent.getBroadcast(context, 0, new Intent(), 0));
		registrationIntent.putExtra(EXTRA_SENDER, senderId);
		context.startService(registrationIntent);
		// TODO: if intent not found, notification on need to have GSF
	}

	/**
	 * Unregister the application. New messages will be blocked by server.
	 */
	public static void unregister(Context context) {
		Intent regIntent = new Intent(REQUEST_UNREGISTRATION_INTENT);
		regIntent.setPackage(GSF_PACKAGE);
		regIntent.putExtra(EXTRA_APPLICATION_PENDING_INTENT, PendingIntent.getBroadcast(context,
				0, new Intent(), 0));
		context.startService(regIntent);
	}

	/**
	 * Return the current registration id.
	 *
	 * If result is empty, the registration has failed.
	 *
	 * @return registration id, or empty string if the registration is not complete.
	 */
	public static String getRegistrationId(Context context) {
		 SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		String registrationId = prefs.getString("dm_registration", null);
		Log.d("System oout", "Registration id in get register "+ registrationId);
		return registrationId;
	}

	public static long getLastRegistrationChange(Context context) {
		final SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		return prefs.getLong(LAST_REGISTRATION_CHANGE, 0);
	}

	static long getBackoff(Context context) {
		final SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		return prefs.getLong(BACKOFF, DEFAULT_BACKOFF);
	}

	static void setBackoff(Context context, long backoff) {
		final SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		Editor editor = prefs.edit();
		editor.putLong(BACKOFF, backoff);
		editor.commit();

	}

	// package
	static void clearRegistrationId(Context context) {
		final SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		Editor editor = prefs.edit();
		editor.putString("dm_registration", "");
		editor.putLong(LAST_REGISTRATION_CHANGE, System.currentTimeMillis());
		editor.commit();

	}

	// package
	static void setRegistrationId(Context context, String registrationId) {
		final SharedPreferences prefs = context.getSharedPreferences(
				PREFERENCE,
				Context.MODE_PRIVATE);
		Editor editor = prefs.edit();
		editor.putString("dm_registration", registrationId);
		editor.commit();
	}

}
